A few years ago I had to install Parallels with Windows 10 on my 27" imac for work. Last fall I was able to remove it. Ever since I installed it, my computer didn't run as well. Since the uninstall it is even worse, boot up times are long, computer freezes at times, and Lightroom is super slow to load and runs slowly. Before I decide to buy a new computer I would love to see if I can give this one more life. I have a time machine backup, but I wouldn't want to restore from that. I'm thinking of cloning (using Carbon Copy Cloner) to an external drive, then wiping the computer clean and reinstalling everything. I have a large lightroom library that I would need to take special care to preserve. The main use of this computer now is for my photo processing. I use a laptop for work. Is this a good or bad idea to redo the imac? I know it would take a lot of thinking to make sure I don't lose anything important. I had a 2010 imac that I replaced with this one. After I got everything I needed off the 2010 one I reformatted it and reinstalled OSX and Greg has been using it for five more years with no problems. I keep thinking, that even though this one is five years old, that it still has a few more years of life left.